M.Sc Chemistry

Please refer to the link provided below for details regarding admissions in Deenbandhu Chhotu Ram University of Science and Technology. More than a vacant seat, you should be worried about last application dates. Admissions for this academic year is most probably closed, but you can check for yourself at the link mentioned below:
https://www.shiksha.com/university/deenbandhu-chhotu-ram-university-of-science-and-technology-sonepat-25196/admission#admission

M.Sc. Chemistry Eligibility:
1) B.Sc. (3 years) degree after 10+2 Major in Chemistry.
2) At least 50% marks in B.Sc. for general candidates or 45% marks for SC/ST

You can either do B.Sc in chemistry or BE/B.Tech in chemistry, and then M.Sc.

Depends on what course you are looking for. GMAT may be required, if you are looking for MIM or MBA. Also, you will need either TOEFL or IELTS depending upon the country you choose.

Please refer to the link provided below for details on M.Sc. courses from Mumbai University. You should be able to download their brochure which contains all details regarding number of seats available for courses in M.Sc.
https://www.shiksha.com/university/university-of-mumbai-fort-campus-856

Please refer to the link provided below for details on how to prepare for your entrance exam in various M.Sc courses.
Link: https://www.shiksha.com/science/articles/how-to-prepare-for-top-msc-entrance-exams-blogId-13489

Please refer to the link provided below for the list of entrance exams for M.Sc courses in India.
Link: https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484